Jacking arrangement for vehicles



March. 16,l 1954 B. BARENYI 2,672,317 JACKING ARRANGEMENT FOR VEHICLES Filed Dec. s, 1949 2 sheets-sheet 1 March 16, 1954 B. BARENYl 2,672,317 JACKING ARRANGEMENT FOR VEHICLES Filed Dec. 3, 1949 2 Sheets-Sheet 2 Patented Mar. 16, 1954 l2,672,551? ,JACKING GEMEN T FQB Bla Barnyi, Stuttgart, ,Germany Applicationiecem'ber 3, y1949,5S1eria1 2151051395989 Claims priority, a

.Decemb 2 .(llaims.

The present invention arrangement of motcryehicles.

The `jacks thus far `arranged on -vehicles vare provided with a liftingmembermovable in axial direction. They aresubstantially lplaced on Athe vehicle in such a Way that, Iwhen the vehicles innormal position (i. e. not raised), their'axes are perpendicular to ythe road. Yet, --this arrangement is disadvantageous =in that rwhen one axle fof the vehicle is `being-lifted by the jack (whereas the other axle-of v the -vehicle-actsasa tulo-rum) thev distance between `the eline of contacty of Vthenvheels Arestingl onfthe :ground fand the point-.eflsupport-of the jack increases, vthusfcaus.- ing :either the Ifootiof .the jack-toaskid orftasifar as vrpossible) .ato ztilt, .or else thefcar to :move' by -.a certain amount-romnzthe :point of supportrof :the jack.

In theraccompanyingdrawings Figs. 41 randfZ are diagrammatic .side-Niews ofifknown ,arrange.. mentsfofeyehicle jacksfshown respectively in gretracted tandeextended positions; Figs. 3 Vanche lare views similarzto ,-Figs. Land 2.of :vehicles pro- Yfded 'with Liackssaccordinggto fthefpresent invention; eandFigs. 5 to 1.8. are Yvieu/'sain'illigs and/.6 simil-anto'. thosefofligsfl :and-2` orFigs. and-4, andiin Figzflfgofffrcnt jacks :,and'finslligcs of...both frontand :rear:iackshown:in;extendedz position, as4v appliedatcafvehicle;of specialzconstruetionein accordance Withthenresent invention.

PThe disadvantages kof the :known jacks are diagrammat-ically li111:staaten by the ..-;drawing, Eig. ;1 andrlzia .2. fSunposelHr-isga f'iack arranged at mesi-rollt;` axleeand.' a :jack :arranged .-at the rear axle. Let :moreover-leggano :letter yAfstand for fthe distance @between ;t:he ;faxis of the areal* jack H2 andthe-,point of TContact.5P-:of .thefront wheelsw-th .tneiroacl- BM-operating the ai ack .1I-I2, the distance from P to the point Q, Wherejack Hz rests on the4 ground, will increase by AA from A to A'.

Due to the horizontal shearing forces coming herein into existence, the jack .is subjected v,to cons-iderable'strainsand runsthe risk of"break ing or slipping toutr of its guide. "Theseprecarious safetyccnditions are a danger e. g. for themechanics Working under the vehicle. Qwjngtc the-,obliqueposition thejackztakes up whenthe vehieleisijacked up, it is moreover necessary-pto extend y--orf/.aI-i-,d to strengthen gthe ,1 guide of :fthe jack, which-entails an additional'iuse ofzmaterial andspace.

Thefobiect of theinventicn is-to removezthis disadvantage a and .consists -essentially ein what, when the vehicleis notraised,the lifting direction of the jackfo'llows aline which is inwardly inclined-to the oor, i. e.:in=such a wayrthat the extendedgiack axisintersects theftransverse-fcenter plane of the vehicle (i. e. the transverse plane relates to "an `improved -jacks lon vehicles, 1particularly pplication .Germany er 11:, 1.94.8

which v-lies ginthe -middle i between 4,the'wheel axles and is perpendicular to Athe direction ofmotion ofrthevehicle) underthe oor level.

arrangement according to the invention Ais Jfor inst-ance Vill-ustra-ted by Fig =3 and Fig. le-in as constant vva distance as possible from the WheelL-center'rR ofthe oppositeftelgxthe front) set of wheels. 'This is substantially #the case when the axis of the jack *is atangent :tosthe radius ydrawn from 1R -to i Q, Ai. e l:when f-=90- When theyehiclefe. g. its rear/axle) fisfraiSed, theaxisof the j ack-is almost at -rightangles (d'2) to the -floor.Y The rdistance 1B =PQ .remains nearly-constantftfvB) 'The advantage of 1 this arrangement `consists-r-in that it substantially prevents-movement--of `the vehicleor shifting of -thepointl voffsupport of vthe jack. lAtfthe:sametirne :the supporting forces are taken vup ali-nder :particularly Ifavorable com ditions "by-thejack`4 'due to; its nearl-yf-perpendicular position to the ground when onezlhalffof-the car-:is raised. 'fHerein,.;thearrangementfmayfalso be :set up a Apriori 'in Such ,a waythat Whenfthe vehicle s (Fig. J4) is siaclied 11p-into this position, the angle between thefaxis of .the `jackand 'the ground fryfequals 90.-orissapredetermined size offnearliyiQO".

It is to be noted, however, 's'thatfin :viewfofsthe fact-'thatf the?, lifting operation of #the Vehicle entails .amextension ofthe ljack in itsslide, itzis theoretically impossible tomaintain the distances RQ .and B, respectively accurately Vconstant. However, by-arrangingthefiack in an oblique-position according `.to fthefinvention, thefvvariations of these .distances are reduced tov a-minimum. This .action canv moreoverfbe `uphelcin-according to the invention by placing the jack Within=tlie Wheel base, kW-itlnth-eresult that the' same stravel ofI the: axle 4to ibo-lifted Will `be; performed with'm shorter stroke of the respective f jack aecording tofthesmallerlever arrn.

Also they horizontal shifting ofv 'thevsupport-i-ng point Q'relatively--to the pointRor P, `respectively 'tejgn-i-n comparis-on to a-placementprthe jacksat =the axles according to J`Elige. g1 and'l will hthus beNreduced correspondingly.

'v'ItLis true that when-the lfront and rear` caxles are lsimultaneously'"liftec by ,operating the dtwo j asks the arrangement according to.n the invention ihas, in vcomparison to 1 `the arrangement known,v they disadvantage that'there occurs a 'longitudinal shifting of the supporting points relative to each other. However, as it is seldom necessary to lift simultaneously the two axles, and jacks are by far mostly utilized for the lifting of one axle only, this disadvantage may unhesitatingly be put up with in consideration of the advantages obtained by the invention.

The invention provides moreover an arrangement of the jack within the wheel base (e. g. at 1/3 to 1/2 the distance between the vehicle axis and the transverse center plane of the vehicle). The advantage of this arrangement consists in a reduction of the stroke or the jack and of the possibly unavoidable differences in the movement ratios. y

Another object of this invention consists in an arrangement of the jacks on vehicles manufactured according to the cell construction method. The jacks are herein arranged within the area of the interstices (gaps) existing between the cells, for instance in the gaps themselves or in their immediate neighborhood. Particularly where the interstices diverge upwardwhich, as a rule, is of particular advantage for the building of the car body from both the points of View of construction and space-such an arrangement results in a particularly eiective action of the jack according to the purpose of above outlined invention. Further advantages are illustrated by the following descriptions of Figs. to 8, which show diagrammatically how such a vehicle of the cell type behaves when operating the jacks.

Suppose the vehicle represented in Figs. 5 to 8 consists of the cells Z1, Z2 and Z3 assembled in some way at ai, a2 and b1, b2, and the assemblage interstices or gaps resulting are Si and S2, respectively. The middle cell Z2 is provided with the jacks, h1 and h2, arranged in the immediate neighborhood oi the gaps, e. g.vin such a way that the jacks remain in their recesses also when not in operation. These jacks may be operated at will mechanically, hydraulically, pneumatically, electrically or the like e. g. by means of a piston or rack.

These jacks may suitably be provided in pairs arranged, if required, on the same transverse plane, so as to render it possible to lift the vehicle axle involved in a uniform and stable fashion. In this case these sets of jacks can be operated jointly, e. g. from the side by means of a transverse shaft or the like.

Fig. 5 shows a vehicle in normal position with jacks h1 and h2 retracted. Fig. 6 shows the same vehicle with jack h2 extended so that the rear wheels clear the ground. In Fig. 7, on the contrary, the front part of the vehicle is raised together with its front wheels by extending jack hi. Further, Fig. 8 shows the lifting of the whole vehicle by the simultaneous extension of the two jacks.

An arrangement of the jacks particularly suitable is furthermore obtained when after removing the cell (e. g. Z1) opposite to the jack (e. g. h2) the cells (Z2, Za) close to the jack are kept in balance by the jack (h2) extended (operated) in such a way that either the one or (after a joint, simultaneous swivelling of the two cells about the point of support of the jack) the other cell is still supported by the ground and supports in turn the other cell in a suspended fashion (as a cantilever). Some specific works, such as for instance assembly, repair etc. may hereby be rendered considerably easier under certain circumstances particularly in cases where supporting is chosen in such a way that the assembled cells assembled rest on the oor in either of the two supporting positions with nearly the same tilting moment around the supporting point. Under certain circumstances, also jacking up of the two cells (e. g. Z2, Za) by means of the jack (h1) arranged at the free assembly gap may be of advantage for assembly and repair works.

What I claim is:

l. The combination of a vehicle having at least two pairs of wheels spaced apart in the longitudinal direction of the vehicle, a jack rigidly mounted on said vehicle in the space between the axes of said pairs of wheels for straight-line downward extension and adapted to elevate all but one of said pairs or wheels ofi a supporting surface, said jack being mounted at such an angle, with respect to the longitudinal axis of said vehicle, that the direction of its movement is substantially perpendicular to a plane extending through the axis of said one pair of wheels and the point of support of the jack when said jack is extended to rst contact the supporting surface, and the stroke of the jack after contact with the supporting surface being of a length equal to the radius of said one pair of wheels.

2. The combination of a vehicle comprising two opposite end sections each having at least one pair of wheels and a central section between said end sections and detachably connected with and supported by said end sections so that said pairs of wheels on the end sections are spaced apart in the longitudinal direction of the vehic e, said end sections being joined to said central section along inclined planes which converge downwardly, and jacks rigidly mounted on said central section adjacent said inclined planes and parallel to the latter for straight-line downward extension, the jacks at each end of said central section being adapted to elevate all but a pair of wheels on the end section at the opposite end of the vehicle orf a supporting surface, each of said jacks being mounted at such an angle, with respect to the longitudinal axis of the vehicle, that the direction of its movement is substantially perpendicular to a plane extending through the axis of said pair of wheels on the opposite end section and the point of support of the jack when said jack is extended to first contact the supporting surface, and the stroke of each jack after contact with the supporting surface being of a length equal to the radii of said pair of wheels on the opposite end section.

BLA BARNYI.

References Cited in the le of this patent 

